I have addressed the bug which slipped through the last build and released v1.14.674. There was a situation when querying for a users first name or last name against a username where the first or last name didn’t exist, the WordPress API returned an empty array and sometimes returned a one element array containing an empty string. I am not sure if this is due to different versions of PHP or some other nuance but this update correctly accounts for both situations. The bug manifested itself as a warning from the phpHtmlLib plugin (which wp-SwimTeam depends on).
The update should appear in the WordPress Dashboard shortly and is available now from the Download Page.